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A196315 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,3,0,2,4 for x=0,1,2,3,4 0
1, 7, 30, 495, 17093, 1313940, 228181579, 88027683663, 75477277195192, 143743832507166333 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Every 0 is next to 0 1's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 4's

Diagonal of A196322

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

..0..2..0..0....0..2..0..0....0..0..0..2....0..2..0..0....2..0..2..0

..2..2..0..0....2..2..0..0....0..0..0..0....2..2..0..0....0..2..3..2

..0..0..0..0....0..0..0..0....2..2..2..0....0..0..2..2....0..2..0..0

..0..0..0..0....0..2..2..0....0..0..2..0....2..0..2..0....0..2..0..2

CROSSREFS

Sequence in context: A271554 A296013 A196338 * A156347 A221402 A065916

Adjacent sequences:  A196312 A196313 A196314 * A196316 A196317 A196318

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 01 2011

STATUS

approved

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Last modified June 25 05:51 EDT 2021. Contains 345452 sequences. (Running on oeis4.)